Mounting for rock drills



Aug. 3, 1937. D. w. HART 2,088,649

' MOUNTING FOR ROCK DRILLS Filed March 1, 1935 2 Sheets-Sheet l fig-2INVENTOR. Du lqy PEI/art BY HIS AT%I Patented Aug. 3, 1937 UNITED STATESPATENT OFFICE MOUNTING FOR ROCK DRILLS Application March 1, 1935, SerialNo. 8,830

4 Claims.

This invention relates to mountings for rock drills, and moreparticularly to a wheel mounting capable of being readily transportedfrom I one drilling site to another.

5 One object of the invention is to enable the l rock drill to bereadily tilted to any desired degree of inclination with respect to theface of the rock being drilled.

Another object is to enable the rock drill to be conveniently positionedfor drilling toe-holes at the foot of a vertical rock face.

Other objects will be in part obvious and in part pointed outhereinafter.

) In the accompanying drawings and in which similar reference numeralsrefer to similar parts,

Figure 1 is a side elevation, partly broken away, of a mountingconstructed in accordance with the practice of the invention and a rockdrilling mechanism which it supports,

Figure 2 is a transverse view taken through Figure l on the line 2-2looking in the direction indicated by the arrows,

Figure 3 is a plan view taken through Figure 1 on the line. 3-3 lookingin the direction indicated by the arrows,

Figure 4 is a plan View of a detail, and

a Figure 5 is a perspective view of a detail.

' Referring more particularly to the drawings, themounting, designatedby 26, includes in its 30 organization a main frame 2|, a column 22supported by the main frame, and wheels 23 and 24, to support themounting.

The frame 2| comprises a pair of side members 25 having portions 26which are arranged in par- 3 a1lelism with respect to each other andconverging portions 2'Iconnected at their free ends by plates 28 and 29disposed on the upper and lower surfaces, respectively, of the members25. In the plates 28 and 29 is journaled the spindle 40 30 of a yoke 3|to which the wheel 24 is pivotally secured.

The wheels 23 are connected to the portions 26 of the members 25 byspindles 32 having flanges 33 fastened to the members 25 by bolts 45 34.Preferably, the free ends of the portions 26 are provided with crossmembers 35 to which the flanges 33 may be secured in order that themounting may be shifted along a line paralleling the rock face, therebyavoiding the necessity of 50 tedious shifting to and fro of themechanism to position the rock drill on a desired line of cut. The crossmembers 35 are suitably perforated to accommodate the bolts 34.

The column 22 may be of a well known type 5 consisting of a pair ofchannel members 36 of which the front legs 31 actas guides for a saddle38. of a rock drill 39 carrying a working implement 46. A furtherfunction of the column 22 is that of a support for a feeding mechanismfor the. rock drill 39. 5

The feeding mechanism illustrated comprises a cylinder M which may besecured to the column 22 in any suitable manner and a piston 42 in thecylinder. The piston has a rod 43 which extends slidably through theupper head 44 of the cylinder 10 and carries a rotatable member 45,illustrated in the present instance as a sheave, which maybe multigrooved to accommodate a pair of flexible members 46 and 41. i

The flexible members 46 and 41 are. shown, 15 for the sake of simplicityof illustration, as cables. One end of that designated 41 is anchored toan arm 4'8,Lat the top of the column 22. It is trained around the underside. of the sheave 45, thence over a sheave 49 at the top of the columnand 20 issecured with its other end to the upper portion of the saddle38. Thus, as the piston 42 isactuated downwardly the sheave 45 pulls onthe cable 41 and moves the rock drill toward the upper or free. end ofthe column 22.

The cable 45 is connected with one end to the head '49 and is trainedover the top of the sheave 45. It then extends downwardly over a sheave56 at the lower portion of the column 22 and its opposite end isconnected to the lower portion of the saddle. 38. The arrangement issuch that when the piston is actuated upwardly the cable 461s drawn topull the rock drill to move toward the :work in accordance with thepenetration of the :working implement thereinto.

The pressure fluid for actuating the piston 42 and the elementsconnected thereto is controlled by' amanuallyoperable valve 5| arrangedin the he'ad M. The pressure fluid may be introduced directly from asource of supply (not shown) 40 into acentral bore 52 in the. throttlevalve. Leadingfrom the bore 52 is a passage or port 53 which "in oneposition of the throttle valve registers'with'a. passage "54, in thehead 44 and opening into. theupper end of the cylinder 4|,and in anotherposition of the throttle valve the port 53 registers with a passage 55consisting of branches in the head 44 and a lower head 56 of thecylinder and a tube 5'! connecting the branches. 5

In the periphery of the throttle valve is a groove 58 to affordcommunication with either of the passages 54 or 55 and an atmosphericexhaust port 59 in the head 44. Thus, as will be readily understood,when the throttle valve 5| is rotated 55 to bring the port 53 intoregistry with the passage 54 pressure fluid flows into the upper portionof the cylinder 41 to move the piston 42 toward the head 56 to raise therock drill 39, and when the port 53 is moved into registry with thepassage 55 pressure fluid is introduced into the lower part of thecylinder 4| to raise the piston 42 and thereby cause the rock drill 39to follow and remain in correct operative relationship with the workingimplement which it actuates. When the port 53 registers with either theport 54 or 55 the groove 58 will establish communication between theremaining passage 54 or 55 and the exhaust port 59.

A specific use of the drilling mechanism so far described is that ofdrilling vertical holes. When used for that purpose the column 22 isdisposed in a vertical position and the holes are drilled in suitablyspaced relation with respect to each other along a predetermined line ofcut.

of the work may be greatly expedited through the use of horizontal holesor holes inclined with respect to the rock face, as for instance at thefoot of a vertical ledge. In order to enable the rock drill to bepositioned for such use the column 22 is provided with oppositelyextending lateral: trunnions 60 which may be secured to the channels 36as by welding.

On the outer or free ends of the trunnions are coniformsurfaces 6| whichseat against corresponding surfaces 62 of apertures 63 in support plates64 arranged on opposite sides of the column. Adjacent the coniformsurfaces 6| and seating against shoulders 15 on the trunnions are ringsor flanges 65 which are disposed loosely on the trunnions and, like theplates 64, are perforated for the accommodation of bolts 66 whereby theconiform surfaces 61 and 62 may be drawn into fixed frictionalengagement with each other.

The plates 64 are adapted toswing in vertical planes between the column22 and the portions 26 of the frame members 25. They constitute the soleconnections. between these elements and are provided, in their endswhich lie. adjacent the frame members, with coniform apertures 61for theaccommodation of similarly shaped disks 68 which may be fixedly clampedinto the apertures 61. by bolts 69 extending through the disks 68 andthe apertures 61 and through bearings lfl'afiixed to the frame members25.

Suitable means, such as anchor rods H may be provided for holding themounting immovable against the effects of vibration incident. to theoperation of the rock drill. The anchor rods have pointed ends 12 whichmay be driven into the supporting ground or seated in depressionsthereof, and in the side members 25 are suitable securing means 13 forthe anchor rods. The securing means 13 are illustrated as being in theform of eye-bolts through the eyes of which the rods 1| extend. Theeye-bolts are provided with nuts which may be manipulated to. draw therods firmly against the sides of the members 25.

In practice, whenever it is desired to drill ver- There are, however,many instances in which the progress tical holes the column'is swung toa vertical position in which the axes of the trunnions 60 and the disks68 lie in substantially the same vertical plane. The bolts 66 and 69 arethen tightened to draw the trunnions and the disks 68 into firmfrictional engagement with the coniform surfaces of the plates 64. Inorder to drill inclined holes the bolts 56 and 59 may be loosened andthe column 22 rocked to the desired degree of inclination with respectto the rock face.

In the event that it be desired to drill inclined holes at the foot of avertical rock ledge the bolts are loosened sufficiently to permitrotation of the plates 64 on the disks 68 and the trunnions. Thetrunnions 66 may then be dropped to a position below the horizontalplane of the disks 66 and the drilling implement 40 may be lowered tothe foot of the ledge. After the column 22 has been thus positioned thebolts are again manipulated to draw the plates 64 into firm frictionalengagement with the disks and the trunnions.

I claim:

1.. A mounting for rock drills, comprising a frame, a guide column, arock drill slidable thereon, support means for the column and beingswingable through the horizontal plane of the frame, pivots forconnecting the support means to the frame, other pivots on oppositesides of the column for connecting the support means to the column andbeing off-set with respect to the first mentioned pivots, and individualclamping means for each pivot to rigidly secure thepivo'ts to the Isupport means.

2..A mounting for rock drills, comprising a frame, a guide column,.arock drill slidable thereon, a pair of support plates arranged onopposite sides of the column and constituting the sole connectionsbetween the column and the frame, pivot means on the frame for one endof the support plates, pivot means on the column for theother ends ofthe support plates and being off-set with respect to the first mentionedpivot means, and means for clamping the support plates fixedly to thepivot means.

3. A mounting for rock drills, comprising a frame, a guide column, arock drill slidable there- 2 on, support plates on opposite sides of thecolumn and being swingable through the horizontal plane of the frame,and a plurality of pivot means spaced along the length of the supportplates for connecting the support plates to theframe and the column. L

4. A mounting for rock drills, comprising a frame, a guide column, arock drill slidable thereon, support plates swingable in vertical planeson opposite sides of the columnand having a coniform aperture in eachend, coniform trunnions on the column seating into the aperturesat oneend of the plates, bolts for clamping the plates to the trunnions,coniform disks seating into the other apertures, and bolts in the framefor clamping the disks fixedly to the plates and for clamping the platesfixedly to the frame.

.DUDLEY w. HART.

